If you want to change the default header layout to display a full width logo just install the following vqmod extension.
<modification>
<id>Use full width logo on Sellegance theme</id>
<version>1.0.0</version>
<vqmver>2.1</vqmver>
<author>everthemes.com</author>
<file name="catalog/view/theme/*/template/common/header.tpl">
<operation>
<search position="replace" offset="7"><![CDATA[<div id="logo" class="span4 offset4">]]></search>
<add><![CDATA[]]></add>
</operation>
<operation>
<search position="replace"><![CDATA[<div class="span4 leftbox">]]></search>
<add><![CDATA[<div class="span4">]]></add>
</operation>
<operation>
<search position="before" index="2"><![CDATA[<div id="links" class="hidden-phone">]]></search>
<add><![CDATA[
</div>
<div class="span4">]]></add>
</operation>
<operation>
<search position="after" index="2"><![CDATA[</div> <!-- .rightbox -->]]></search>
<add><![CDATA[
</div>
<div class="row">
<div id="logo" class="span12">
<?php if ($logo) { ?>
<a href="<?php echo $home; ?>"><img src="<?php echo $logo; ?>" title="<?php echo $name; ?>" alt="<?php echo $name; ?>" /></a>
<?php } ?>
</div> <!-- #logo -->
]]></add>
</operation>
<operation>
<search position="before"><![CDATA[</style>]]></search>
<add><![CDATA[
@media only screen and (max-width: 767px) {
#cart { top: -13px; }
#cart h4 { display: none; }
#cart .heading { height: 18px; }
}
#links { padding-top: 12px; }
#logo img { width:100%; max-width:auto; }
]]></add>
</operation>
</file>
</modification>
Short URL: http://goo.gl/RMxuf